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MD380 User Manual Desc
ription of Function Codes
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Figure 6-28 PID parameters switchover
PID deviation
PI
parameters
Group 1 of PID
parameters
FA -19 FA -20
FA -05, FA -06, FA -07
FA -15, FA -16, FA -17
Group 2 of PID
parameters
F unction Code Parameter Name Setting Range Default
F A-21 PID initial value 0.0%–100.0% 0.0%
F A-22 PID initial value holding time 0.00–650.00s 0.00s
When the AC drive starts up, the PID starts closed-loop algorithm only after the PID output
is fixed to the PID initial value (FA-21) and lasts the time set in FA-22.
Figure 6-29 PID initial value function
Output
frequency
PID initial value
FA -21
PID initial value
holding time FA -22
Time
F unction Code Parameter Name Setting Range Default
F A-23
Maximum deviation between two PID
outputs in forward direction
0.00%–100.00% 1.00%
F A-24
Maximum deviation between two PID
outputs in reverse direction
0.00%–100.00% 1.00%
This function is used to limit the deviation between two PID outputs (2 ms per PID output) to
suppress the rapid change of PID output and stabilize the running of the AC drive.
FA-23 and FA-24 respectively correspond to the maximum absolute value of the output
deviation in forward direction and in reverse direction.